JP2511526Y2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a liquid crystal display device, and more particularly to a structure of a flexible substrate connected to a glass substrate of liquid crystal.

(B) Conventional Technology In recent years, flat-panel liquid crystal display devices have been studied and commercialized for laptop personal computers, televisions and the like.

The main reason for these products is that they are thin and lightweight, and so each company is making efforts to develop them.

As an example of this, there is a liquid crystal display device disclosed in Japanese Unexamined Patent Publication No. 02-29621, for example, and the structure thereof will be described below.

First, a pair of glass substrates (41) filled with liquid crystal,
(42), a so-called liquid crystal panel is sandwiched between a pair of cabinets, but the drawing of this cabinet is omitted here for the sake of clarity.

Next, a printed circuit board (45) is provided on the glass substrates (41) and (42) via a spacer (44). The spacer (44) and the printed circuit board (45) adopt a backlight system. Therefore, it has a ring shape with the center removed as shown in FIG.

Further, in order to efficiently connect the electrode (43) of the glass substrate (41) and the electrode (52) of the printed circuit board (45),
The thin flexible board (49) is the board (44), (4
It is bent so as to cover the side of 5).

The flexible substrate (49) is made of a resin such as polyimide, a copper foil is formed on the surface in a predetermined shape, and the copper foil is plated with gold or tin. Further, on both sides of the flexible substrate (49), the connection electrode groups (50), (5
1) is formed, one connection electrode group (50) is connected to the electrode (43) of the glass substrate, and the other connection electrode group (51) is connected to the electrode (52) of the printed circuit board.

(C) Problems to be solved by the invention Here, an IC (53) for driving an LCD is mounted on the flexible board (49), and the output of this IC is on one side of the flexible board (49). Of the connection electrode group (50). Further, the connection electrode group (50) and the glass substrate (41) are bonded together by applying heat, pressure and the like through an anisotropic conductive film or the like.

Therefore, if the output of the IC is 240, the number of electrodes of one of the connection electrode groups (50) needs to be 240 or more, and the pitch of the connection electrode groups (50) is, for example, 0.2 mm. When pressure or temperature is applied in this pitch state, due to the difference in thermal expansion coefficient, the pitch of the connection electrode group (43) of the glass substrate (41) is displaced from that of a certain electrode of the flexible substrate (49). Sometimes did not contact a predetermined electrode.

(D) Means for Solving the Problems The present invention has been made in view of the above problems, and is provided at a substantially right angle on one side of the first substrate (41) having a predetermined circuit function. The first connection electrode group (43) and the second connection electrode group (43) provided on the second substrate (49) facing the first connection electrode group (43) and electrically connected to each other, and having thinness and flexibility. This is achieved by providing the first cutout (54) in the second substrate (49) corresponding to the second connection electrode group (50).

Further, in the flexible substrate (49) formed in the substantially rectangular wing shape by the first cut (54), the inside of the second connection electrode group (50) corresponding to the heating region (55). Then, the problem is solved by providing the second notch (56) substantially at right angles to the first notch (54).

(E) Action For example, if two first notches (54) are provided as shown in FIG. 1, the second connection electrode group (50) is divided into three blocks, and the flexible substrate (49) is Corresponding to this, three quadrilateral wing-shaped regions are formed in the lateral band, and the expansion of the flexible substrate (49) due to heat is 1 /
Since it is reduced to 3, the deviation between the pitch of the first connection electrode group (43) of the glass substrate (41) and the pitch of the second connection electrode group (50) of the flexible substrate (49) is reduced.

Further, in the flexible substrate (49) formed in the substantially rectangular wing shape by the first cut (54), the inside of the second connection electrode group (50) corresponding to the heating region (55). By providing the second notch (56) substantially at right angles to the first notch (54), distortion due to the temperature difference between the thermocompression bonding region (55) and the region where heat is not applied can be removed, Further, good contact can be achieved between the first connection electrode group (43) and the second connection electrode group (50).

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

For example, a liquid crystal television or the like has a set of liquid crystal panel components (4 panels shown in FIG. 3 between the upper cabinet and the lower cabinet).
0) is clamped and fixed. The present invention will explain the above-mentioned liquid crystal panel structure (40).

First, there is a pair of glass substrates (41) and (42). One glass substrate (41) is formed larger than the other glass substrate (42) in order to provide the first connection electrode group (43) on the periphery. The pair of glass substrates (41) and (42) are provided with a TFT, a gate electrode, etc. for displaying a liquid crystal and filled with a liquid crystal. The first connecting electrode group (43) is provided on the back side of one glass substrate (41) in the figure.
It is made of ITO.

Next, a printed board (45) is provided on the pair of glass substrates (41) and (42) via a spacer (44),
The spacer (44) and the printed circuit board (45) have a ring shape with the center removed as shown in FIG. 3 because the backlight system is adopted.

Since the IC (46), the chip resistor (47), the connector (48) and the like are formed to project on the printed circuit board (45), these elements are included in the spacer (44) in the spacer (44). ) Is removed so as not to come into contact with), and the actual shape is more intricate than that in FIG. 3, and a hole such as a quadrangle is formed in part.

In addition, the first connection electrode group (4
3) and the electrodes of the printed circuit board are efficiently connected, a thin flexible substrate (49) is provided on the substrate (44),
It is bent so as to cover the side of (45).

The flexible substrate (49) is formed of, for example, a polyimide resin, a copper foil is formed in a predetermined shape on the surface,
This copper foil is plated with gold or tin.

Further, on both sides of the flexible substrate (49), a second connection electrode group (50) and a third connection electrode group (51) are formed by the above-mentioned copper foil so as to go straight to the side edges. The second connection electrode group (50) is the first connection electrode group (43) formed on the back surface of the glass substrate (41), and the other third connection electrode group (51) is the back surface of the printed circuit board. It is connected to the fourth connection electrode group (52).

Then, in the printed circuit board (45), a copper foil is etched into a predetermined shape on the resinous substrate to form a conductive path as described above. A signal from the outside is transmitted from the connector (48) to the fourth connection electrode group (52) on the back surface of the printed board (45) through the copper foil circuit, the IC (46), the chip resistor, the through hole, etc. The output of the IC is transmitted to the IC of the flexible substrate (49) through the fourth connection electrode group (52) and the third connection electrode group (51), and the output of the IC is transmitted to the second connection electrode group (50) and the first connection electrode group (50). It is transmitted to the TFT formed on the glass substrate through the connection electrode group (43).

The feature of the present invention resides in the above-mentioned flexible substrate (49), and a concrete view thereof is shown in FIG.

On the flexible substrate (49), an IC for driving the LCD
(53) is mounted, and the output of this IC is led to the second connection electrode group (50) on one side of the flexible substrate (49). Moreover, the connection electrode group (50) and the glass substrate (41) are bonded together by applying heat, pressure, etc., through an anisotropic conductive film or the like.

Here, the output of the IC (53) is 240, and since it is formed on the side of the flexible substrate (49) with a length of about 30 mm, the pitch is, for example, 0.2 mm or less.

Conventionally, when pressure or temperature is applied in this pitch state, due to the difference in the thermal expansion coefficient, the second connection electrode group (50)
In some cases, the pitch of the connection electrode group (43) of the glass substrate (41) and the gap thereof are different from each other, and a certain electrode may not come into contact with a predetermined electrode.

In order to solve this problem, the present invention solves this problem by forming a first notch (54) substantially perpendicular to the side of the flexible substrate (49).
Was formed. Here, two notches are provided substantially evenly. Therefore, the expansion accumulated by thermocompression bonding of the flexible substrate (49) is reduced to 1/3. Further, two flexible substrates (49) are formed on each of the three sides other than the side of the glass substrate (41) corresponding to the side on which the connector (48) is provided. It is also possible to combine two flexible boards (49) into one. In this case, the number of steps of attaching the flexible substrate (49) can be reduced to half.

Further, in the flexible substrate (49), a second portion is formed inside the second connection electrode group (50) corresponding to the heating region (55) and substantially perpendicular to the first cutout (54).
By providing the notch (56) and removing the distortion due to the temperature difference between the heating region (55) and the inner non-heating region, the deviation can be further prevented.

On the other hand, the third connection electrode group (51) and the fourth connection electrode group (52) are connected by solder. Since this connecting electrode group has a wider pitch and a larger electrode width than the second connecting electrode group (50), the notch is not required, but when a shape such as the second connecting electrode group is required, After all, the deviation can be prevented by providing the notch.

A third notch (57) is provided at the center of FIG. 1, and this notch is for facilitating bending of the flexible substrate (49).

(G) Effect of the Invention As is clear from the above description, the present invention provides a cut between the second connection electrode groups of the flexible substrate, or more than the second connection electrode group corresponding to the heating region. By providing the second notch on the inner side substantially at a right angle to the first notch, it is possible to prevent the deviation between the first connecting electrode group and the second connecting electrode group, and to provide a flexible substrate having a longer dimension. Can be used.

Further, depending on the number of the cuts, the entire one side of the glass substrate can be attached with one flexible substrate, and the number of attaching steps can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a flexible substrate which is a feature of the present invention, FIG. 2 is a plan view of a conventional flexible substrate, and FIG. 3 is a perspective view showing the configurations of a flexible substrate, a glass substrate spacer and a printed circuit board. is there.

Claims (3)

(57) [Scope of utility model registration request] 1. A first connecting electrode group provided on one side of a first substrate having a predetermined circuit function at a substantially right angle, and electrically facing the first connecting electrode group. A second connecting electrode group provided on a second substrate which is connected, thin, and flexible, and a first notch is provided on the second substrate corresponding to the second connecting electrode group. A plurality of substantially rectangular wing-shaped portions, and in the flexible substrate formed in the substantially rectangular wing shape by the first cut, inside the second connection electrode group, A liquid crystal display device, wherein a second notch is provided substantially perpendicular to the first notch. 2. A pair of glass substrates, each of which is filled with a liquid crystal and provided with a first connecting electrode group substantially at right angles to a side thereof, and which face each other substantially with the first connecting electrode group. , A flexible substrate electrically connected by applying heat and provided with a second connection electrode group substantially at right angles to the sides, and a flexible substrate provided with heat on the flexible substrate. The flexible substrate corresponding to between the two connection electrode groups is provided with at least one first notch to form a substantially rectangular wing-shaped portion, and the flexible member is formed into a wing-like shape by the first notch. 2. A liquid crystal display device, characterized in that, on a flexible substrate, a second notch is provided substantially inside the second connection electrode group corresponding to the heating region and at a right angle to the first notch. 3. The second notch is provided between the first notches, and the second notch is located outside the flexible substrate with respect to the tip of the first notch. The liquid crystal display device according to claim 1 or 2.